Portable tree-felling saw



1,62 ,55 Aprll 26,1927. A. RADTKE 6 3 PORTABLE TREE FELLING SAW Ori inal Filed June 5, 1924 ceptacle', said saw driving mechanism manner, is arrange PATENT OFFICE.

UNITED STATES,

or BERLIN, eamnainr.

ALBERT imnrxn,

PORTABLE 'llRil lllilillZElIAl'JIIll'G: SAW. A

Application filed June a, 1924, Serial No. 717,505,

This invention relates to a portable treefelling saw and it consists in constructing the saw blade as a sector equal to a quarter of a circle having an aperture through which the wood chips drop into the chip collecting device which may consist of an elastic reblade being mounted on a movable slide so that it can execute an oscillating movement in horizontal plane.

The invention consists further in that the for the saw can be raised and lowered by. means of hand levers in such a manner that a bar on which the movable frame is fixed is guided in a U-ironbe raised and lowered by aof engagement and and adapted to pawl being pulled out brought in engagement with the aid of a pull rope with notches of said bar. I An embodiment of the invention is shown by way of example on the accompanying drawing, in which: Fig. 1 is a perspective view of the treefelling saw. 4

Fig. 2 is a plan view of Fig. 1.

Fig. 3 shows part of nism in elevation.

The tree-felling machine or saw consists,

according to the invention,- of a" frame a onwhich the slide b, ided in a convenien which is continuously gressed forward by the action of springs 0. n the slide b the saw blade which has the shape of a sector eq ualto a quarter ofa circle is arranged, this sawblade having an aperture e. simpl lever mechanism serves for producing the oscillation of the saw blade 1n horizontal direction. When the hand lever f is moved to and fro the saw blade 11 is oscillated by means of toothed crown transmission.

. Directly under the saw frame a chip collector is arranged which consists of arms 9 hingedly mounted under the adjusting mechaleast with the working of the 'saw blade.

by said arms against the tree and in Germany May 5, 192B. Renewed December 14, 1926.

the saw frame on a pivot pin it and acted upon by a spring 11 in such a manner that a spring k arranged above the arms 9 or a bag Z attached to said spring is permanently pressed against the-tree to be felled. The bag Z is further held by the bows m. The mechanism for raising and lowering the saw frame consists of a bar 1:. on .which the movable frame a is fixed, said bar being guided in U-irons o. A 1 pawl 72. engaging with notches of the bar is adapted to be pulled out of engagement with said notches by means of a pull rope so that the saw frame can be :raised. or lowered by operating the hand levers 1'.

A chain 8 is preferablywound around the tree to. be felled and attached to the sawing machine in order to ensure that the saw' blade is permanently pressed against said tree. I

The invention presents considerable ad= vantages over the tree-felling saws of known construction, for instance that it can be used 5 even when trees are standing close together and that the chip-collecting device, arranged under the machine does not interfere. in the 4 I claim t A pprtable tree-felling saw of the type descn ed comprising in combination with the movable frame and with the saw blade.

having a large aperture, two arms hingedly mounted under said saw pulling said arms together, a spring above said armsfa bag attached to said last mentioned spring and bows for holding said bag, said last me tioned spring being pressed to be felled.

In testimony whereof '1 atiix my signature.

ALBERT RADTKE. I

frame, a spring for. 

